Investigation of Strain Characteristics of Graphite Polyetherether Ketone Using a Nonlinear Analysis and Experimental Methods

Author

Stephen C. Gould

Date of Award

12-1990

Document Type

Thesis

Degree Name

Master of Science in Aeronautical Engineering

Department

Department of Aeronautics and Astronautics

First Advisor

Anthony N. Palazotto, PhD

Abstract

A geometric nonlinear technique is incorporated in a current finite element program. This nonlinear program allows material nonlinearity for calculating the stresses, strains and failure of composites. The improved program uses an updated Langrangian to calculate the stresses and strains. In addition, it updates the fiber orientation due to displacement in order to calculate the updated stiffness matrix. This method is valuable for large strain values. The analytical data were compared to experimental data obtained from Graphite PolyEtherEther Ketone laminates. To obtain data two geometries were used. Digitized photographs were used to measure the angle change for large strains.

AFIT Designator

AFIT-GAE-ENY-90D-08

DTIC Accession Number

ADA230527

Comments

The author's Vita page is omitted.

Recommended Citation

Gould, Stephen C., "Investigation of Strain Characteristics of Graphite Polyetherether Ketone Using a Nonlinear Analysis and Experimental Methods" (1990). Theses and Dissertations. 7844.
https://scholar.afit.edu/etd/7844